FWIW, we've not had a feature request for this ever, nor has there been a request for pprint to support attrs, nor any other hand-rolled class that implements methods similar to those generated by dataclasses.  AFAICT, this tracker issue wasn't motivated by a known use case; rather, it was "my PR was accepted for SimpleNamespace and thought dataclasses could be the next."

In the absence of known use cases and user requests, I think we should let it be.  Put me down for a -0.